TechSpot

Computer Not Turning On When Pressing Switch

By Pedro N
Jan 21, 2016
Post New Reply
  1. Hey guys...
    I got a computer that won't turn on anymore when pressing the switch. The small light at the bottom of the motherboard indicates that it indeed gets electricity, at least until the light

    A few things I've tried already:
    - Another Power Outlet
    - New Power Supply
    - New Switch
    - Unplugged the switch from the motherboard and touched both pins with a paper clip

    After trying all that, I was completely on the end...
    Is there anybody that can help me with what to do next?
     
  2. cliffordcooley

    cliffordcooley TS Guardian Fighter Posts: 8,558   +2,900

    Try disconnecting everything from the motherboard. Then try booting with only CPU and one RAM module. See if it acts differently, and if so put the additional components back one at a time while checking to see if the system still boots.

    If the system doesn't try booting with all peripherals disconnected, the Motherboard or CPU may be damaged.
     
  3. Cycloid Torus

    Cycloid Torus TS Evangelist Posts: 1,664   +312

    Hypothesis: dead motherboard. Problem is we do not know what may have killed (or is shorting) the motherboard.

    Any thunderstorms? Surge protector?

    Is there a system speaker - if so are there beep codes?

    Does the LED on the motherboard follow a pattern (5 fast flashes, etc)? Check manufacturer for code.

    Then I would probably remove everything and rebuild on the bench after making sure no little bits of metal have landed in a memory slot

    If your power is from a 'good' manufacturer, you might test your power supply on another computer - be careful as it might have been the PSU which killed your MB.
     
  4. Pedro N

    Pedro N TS Rookie Topic Starter

    I disconnected everything from the motherboard, no changes... Since only one RAM slot is in use, I inserted it in another slot and still no change
     
  5. Pedro N

    Pedro N TS Rookie Topic Starter

    No thunderstorms... Surge protector present...
    The motherboard has a speaker, but pressing the switch nothing happens, no beep on the speaker, no fan starts turning, nothing.

    The LED on the motherboard is on, no flashes just on.

    I tried the old and the new power supply on another computer, and everything works like a charm on another computer.
     
  6. cliffordcooley

    cliffordcooley TS Guardian Fighter Posts: 8,558   +2,900

    Does it not post without the RAM module inserted? You should at least get a BIOS post on screen without the module.
     
  7. Pedro N

    Pedro N TS Rookie Topic Starter

    Tried turning it on without the RAM module inserted... And NOTHING... No BIOS post, no fan, no beep
     
  8. cliffordcooley

    cliffordcooley TS Guardian Fighter Posts: 8,558   +2,900

    It doesn't look good for the motherboard.
     
  9. Pedro N

    Pedro N TS Rookie Topic Starter

    Is there any way to find out what caused the motherboard to fail? Because I could just probably order a new motherboard and replace it, but won't it happen again right away?
     
  10. cliffordcooley

    cliffordcooley TS Guardian Fighter Posts: 8,558   +2,900

    I wouldn't know how to check for faults in a motherboard. As for the next board getting damaged the same way, that is unlikely unless it is a common problem with that specific motherboard.
     
    Pedro N likes this.
  11. Pedro N

    Pedro N TS Rookie Topic Starter

    Alright, thanks a lot!! I appreciate it!
     
  12. Cycloid Torus

    Cycloid Torus TS Evangelist Posts: 1,664   +312

    With no codes, I would take a magnifying glass to it - look for little brown burn spots around the various chips and for misshapen capacitors. Likely, something basic burned out.

    As to new board, you could go cheap - and buy 2 year old tech for $40-60. You could try to re-use CPU or not. Ebay can have some super bargains..
     
    Pedro N and cliffordcooley like this.
  13. Pedro N

    Pedro N TS Rookie Topic Starter

    Thanks... But anyhow if I would find those brown spots I would have to buy a new one...

    About the ebay thing... I'm Mexican, and somehow here in Mexico that stuff is not that easy!!
    Sucks to be me, I know!! Haha
     
  14. Cycloid Torus

    Cycloid Torus TS Evangelist Posts: 1,664   +312

    Sometimes a soldering iron and another broken motherboard...

    Anyway, look for ebay vendors who participate in Global Shipping...
    http://announcements.ebay.com/2013/...exico-new-zealand-israel-and-the-philippines/

    and ship to your daytime location.

    Mexico
    Paugito <---- This is a Fry's / Tiger Direct type store but they do sell PC parts
    PC Domino
    PC Mexico
    Digital Life
    Dimercom Mexico <--- sells lots of gaming specific and overclocking components
    PC Digital
    PC Experts
    Tunueva PC
     
    Last edited: Jan 21, 2016
    Pedro N likes this.

Similar Topics

Add New Comment

You need to be a member to leave a comment. Join thousands of tech enthusiasts and participate.
TechSpot Account You may also...